/* 1、要用vw转根元素100px 
   2、100px = ？vw
   3、1vw = 视窗宽度*1% = 7.5px */

html {
    font-size: 13.333333vw;
}

body {
    font-size: 12px;
}

/* vertical-align: top; 给行内元素加，给块元素加没有作用 */
.header {
    height: 1.03rem;
    background: skyblue;
    font-size: .4rem;
    color: #fff;
    text-align: center;
    line-height: 1.03rem;
}

.reg {
    padding: 0 .35rem;
}

.reg input[type="text"] {
    width: 6.8rem;
    height: .77rem;
    border: none;
    border-bottom: 1px solid #ccc;
    margin-top: .64rem;
    font-size: .33rem;
    color: #ccc;
}

.reg input[type="submit"] {
    width: 6.8rem;
    height: 1.03rem;
    background: skyblue;
    font-size: .4rem;
    color: #fff;
    text-align: center;
    line-height: 1.03rem;
    border: none;
    margin-top: .94rem;
    border-radius: 3px;
}